[cairo-bugs] [Bug 33711] New: Alpha Value Normalization from 255 to 128

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Jan 30 02:43:54 PST 2011


           Summary: Alpha Value Normalization from 255 to 128
           Product: cairo
           Version: 1.8.8
          Platform: Other
        OS/Version: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: image backend
        AssignedTo: cworth at cworth.org
        ReportedBy: ssseintr at gmail.com
         QAContact: cairo-bugs at cairographics.org

Dear Cairo Team,

Thanks for the excellent graphics engine. My self Vicky and developing embedded
applications for consumer electronics. 

I'm using cairo in one platform it is linux based. The problem is the hardware
in which I'm working restricts the Alpha value to 128(in ARGB32). So both cairo
drawing & native drawing makes the hardware acceleration impossible. I'm using
cairo's image surface, not any native backend's like x11 or directfb.

Can u pls show me the way where can i restrict the alpha value to 128. So for
my platform, 0-full transparent & 128-Opaque.

Thanks in advance.

With Regards,

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